Mid-Holocene Cultural Interaction between the North Coast of Peru and Ecuador

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Abstract
Incised pebbles found at the mid-Holocene, Middle Preceramic period Ostra Base Camp site on the Peruvian north coast demonstrate long-distance links to coastal Ecuador, 700 km to the north. The artifacts belong to a northwestern Andean pebble-figurine tradition associated with the tropical coast. Environmental indicators at the Ostra site show a warm-water lagoonal environment, unlike the modern cold-water conditions of northwestern Peru but similar to modern Ecuador. The Ostra site dates between ca. 5500 and 6250 B.P. (3550 and 4300 B.C.), during a hiatus in the coastal Ecuadorian record, so the link to Ecuador provides the earliest evidence of long-distance cultural interaction between these regions. Until contemporary sites are found in Ecuador, the Ostra Base Camp site provides our only example for this time of tropical coastal cultures of the northwestern Andean interaction sphere.